That's a communication problem, or an organizational problem. We use Slack at my company and we have a policy--developed by communication with one another--that

That's a communication problem, or an organizational problem. We use Slack at my company and we have a policy--developed by communication with one another--that "notification" type things of that sort go into their own channel specifically for the purpose so that anybody who is interested enough can be invited or join (if it's public).